CN113273246A

CN113273246A - Wireless communication method, terminal equipment, access network equipment and core network equipment

Info

Publication number: CN113273246A
Application number: CN201980088667.2A
Authority: CN
Inventors: 刘建华; 王淑坤; 许阳
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2021-08-17
Anticipated expiration: 2039-06-21
Also published as: US20220116910A1; EP3972337A1; EP3972337A4; CN113273246B; EP3972337B1; WO2020252795A1

Abstract

A wireless communication method, a terminal device, an access network device and a core network device, the method comprising: the method comprises the steps that a terminal device sends first indication information to a first network device, wherein the first indication information is used for indicating that the terminal device is to be switched from a first network or a system to a second network or the system, and the first network device is an access network device or a core network device in the first network or the system.

Description

Wireless communication method, terminal equipment, access network equipment and core network equipment

Technical Field

The embodiment of the application relates to the field of communication, in particular to a wireless communication method, terminal equipment, access network equipment and core network equipment.

Background

In the related art, when a plurality of Subscriber Identity Module (SIM) cards exist in a terminal device, the terminal device may reside, register, and stand-by in a plurality of networks or systems, where each SIM card may correspond to one network or system. When the terminal device has only one transmission/reception channel, for example, only one transmission/reception rf channel and/or baseband channel, the terminal device cannot simultaneously perform data communication with the network device in multiple networks. Therefore, when the terminal device is performing service transmission with the network device in the network in the first network or system corresponding to the first SIM card, if the second network or system corresponding to the second SIM card also needs to transmit the service, the terminal device will switch the transmission/reception channel to the network or system corresponding to the second SIM card. The network connection of the terminal device in the first network or system is released within a certain time, so that when the terminal device finishes the service of the second network or system and returns to the first network or system, the terminal device needs to reestablish the connection, which causes service interruption and affects user experience.

Disclosure of Invention

The embodiment of the application provides a wireless communication method, terminal equipment, access network equipment and core network equipment, which are beneficial to avoiding service interruption when the terminal equipment switches a system.

In a first aspect, a method of wireless communication is provided, including: the method comprises the steps that a terminal device sends first indication information to a first network device, wherein the first indication information is used for indicating that the terminal device is to be switched from a first network or a system to a second network or the system, and the first network device is an access network device or a core network device in the first network or the system.

In a second aspect, a method of wireless communication is provided, including: a first access network device receives first indication information sent by a terminal device, wherein the first indication information is used for indicating that the terminal device is to be switched from a first network or system to a second network or system, and the first access network device is an access network device in the first network or system; and the first access network equipment switches the state of the terminal equipment in the first network or system from an active state to an inactive state or a suspended state.

In a third aspect, a method of wireless communication is provided, including: the method includes that first core network equipment receives first indication information sent by terminal equipment, the first indication information is used for indicating that the terminal equipment needs to be switched from a first network or a system to a second network or the system, and the first core network equipment is core network equipment in the first network or the system.

In a fourth aspect, a terminal device is provided, configured to perform the method of the first aspect or any possible implementation manner of the first aspect. In particular, the terminal device comprises means for performing the method of the first aspect described above or any possible implementation manner of the first aspect.

In a fifth aspect, an access network device is provided for performing the method of the second aspect or any possible implementation manner of the second aspect. In particular, the network device comprises means for performing the method of the second aspect described above or any possible implementation of the second aspect.

A sixth aspect provides a core network device, configured to perform the method in the third aspect or any possible implementation manner of the third aspect. In particular, the network device comprises means for performing the method of the third aspect or any possible implementation manner of the third aspect.

In a seventh aspect, a terminal device is provided, where the terminal device includes: including a processor and memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory, and executing the method in the first aspect or each implementation manner thereof.

In an eighth aspect, an access network device is provided, which includes: including a processor and memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory, and executing the method of the second aspect or each implementation mode thereof.

In a ninth aspect, there is provided a core network device, including: including a processor and memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory, and executing the method in the third aspect or each implementation manner thereof.

A tenth aspect provides a chip for implementing the method of any one of the first to third aspects or implementations thereof.

Specifically, the chip includes: a processor configured to call and run the computer program from the memory, so that the device on which the chip is installed performs the method according to any one of the first to third aspects or the implementation manners thereof.

In an eleventh aspect, a computer-readable storage medium is provided for storing a computer program, which causes a computer to perform the method of any one of the first to third aspects or implementations thereof.

In a twelfth aspect, there is provided a computer program product comprising computer program instructions to cause a computer to perform the method of any of the first to third aspects or implementations thereof.

In a thirteenth aspect, there is provided a computer program which, when run on a computer, causes the computer to perform the method of any one of the above first to second aspects or implementations thereof.

Based on the above technical solution, when a terminal device is to be switched from a first network to a second network, the terminal device may send indication information to a network device in the first network to indicate that the terminal device is to be switched from the first network or the system to the second network or the system, and further, the network device in the first network may switch a state of the terminal device in the first network from an active state to an inactive state or a suspended state, so that when the terminal device is switched back to the first network, service transmission may be performed according to a network connection established before being continuously used, or a network connection of the terminal device in the first network may be quickly recovered, which is beneficial to avoiding interruption of service transmission in the first network, and thus user experience may be improved.

Drawings

Fig. 1 is a schematic diagram of an application scenario provided in an embodiment of the present application.

Fig. 2 is a schematic flow chart of a method for wireless communication according to an embodiment of the present application.

Fig. 3 is a schematic interaction diagram of a method of wireless communication according to an embodiment of the present application.

Fig. 4 is a schematic interaction diagram of a method of wireless communication according to an embodiment of the present application.

Fig. 5 is a schematic interaction diagram of a method of wireless communication according to an embodiment of the present application.

Fig. 6 is a schematic interaction diagram of a method of wireless communication according to an embodiment of the present application.

Fig. 7 is a schematic block diagram of a terminal device according to an embodiment of the present application.

Fig. 8 is a schematic block diagram of an access network device according to an embodiment of the present application.

Fig. 9 is a schematic block diagram of a core network device according to an embodiment of the present application.

Fig. 10 is a schematic block diagram of a communication device according to another embodiment of the present application.

Fig. 11 is a schematic block diagram of a chip provided in an embodiment of the present application.

Fig. 12 is a schematic block diagram of a communication system according to an embodiment of the present application.

Detailed Description

Technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (Long Term Evolution, LTE) System, an LTE Frequency Division Duplex (FDD) System, an LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication System, or a 5G System.

Illustratively, a communication system 100 applied in the embodiment of the present application is shown in fig. 1. The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal device 120 (or referred to as a communication terminal, a terminal). Network device 110 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within that coverage area. Optionally, the Network device 110 may be a Base Transceiver Station (BTS) in a GSM system or a CDMA system, a Base Station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, or a wireless controller in a Cloud Radio Access Network (CRAN), or may be a Network device in a Mobile switching center, a relay Station, an Access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a Network-side device in a 5G Network, or a Network device in a Public Land Mobile Network (PLMN) for future evolution, or the like.

The communication system 100 further comprises at least one terminal device 120 located within the coverage area of the network device 110. As used herein, "terminal equipment" includes, but is not limited to, connections via wireline, such as Public Switched Telephone Network (PSTN), Digital Subscriber Line (DSL), Digital cable, direct cable connection; and/or another data connection/network; and/or via a Wireless interface, e.g., to a cellular Network, a Wireless Local Area Network (WLAN), a digital television Network such as a DVB-H Network, a satellite Network, an AM-FM broadcast transmitter; and/or means of another terminal device arranged to receive/transmit communication signals; and/or Internet of Things (IoT) devices. A terminal device arranged to communicate over a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal", or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data Communications capabilities; PDAs that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. Terminal Equipment may refer to an access terminal, User Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, User terminal, wireless communication device, User agent, or User Equipment. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device having Wireless communication capabilities, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved PLMN, etc.

Optionally, a Device to Device (D2D) communication may be performed between the terminal devices 120.

Alternatively, the 5G system or the 5G network may also be referred to as a New Radio (NR) system or an NR network.

Fig. 1 exemplarily shows one network device and two terminal devices, and optionally, the communication system 100 may include a plurality of network devices and may include other numbers of terminal devices within the coverage of each network device, which is not limited in this embodiment of the present application.

Optionally, the communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should be understood that a device having a communication function in a network/system in the embodiments of the present application may be referred to as a communication device. Taking the communication system 100 shown in fig. 1 as an example, the communication device may include a network device 110 and a terminal device 120 having a communication function, and the network device 110 and the terminal device 120 may be the specific devices described above and are not described herein again; the communication device may also include other devices in the communication system 100, such as other network entities, for example, a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

Fig. 2 is a schematic flowchart of a method for wireless communication according to an embodiment of the present application, where the method may be performed by a terminal device in the communication system shown in fig. 1. As shown in fig. 2, the method 20 includes at least the following:

s210, a terminal device sends first indication information to a first network device, where the first indication information is used to indicate that the terminal device is to be switched from a first network or system to a second network or system, and the first network device is an access network device or a core network device in the first network or system.

In this embodiment of the present application, the terminal device may support multiple networks or systems, where the multiple networks or systems may be networks or systems corresponding to multiple SIM cards of the terminal device, and for example, the multiple networks or systems may correspond to different frequency bands or systems.

When the terminal device determines to switch from a first network to a second network, the terminal device may send indication information to a first access network device of the first network, and notify the first access network device that the terminal device is to switch from the first network to the second network, so that the first access network device may switch the state of the terminal device in the first network to an inactive state or a suspended state.

In this embodiment of the application, when the state of the terminal device in the first network is an inactive state, the terminal device maintains network connections with the core network side and the access network side in the first network, and the core network side and the access network side of the first network and the terminal device side both maintain context information of the terminal device in the first network, so that when the terminal device returns to the first network from the second network, the terminal device does not need to initiate a process of reestablishing a network connection, but can continue to use a network connection that has been established before for communication, which can reduce signaling overhead of reestablishing a connection, and can avoid interruption of a service, thereby improving user experience.

In this embodiment of the application, when the state of the terminal device in the first network is a Suspend (Suspend) state, the network connection between the terminal device and the core network side and the network side in the first network is released, and the core network side and the network side in the first network and the terminal device side both maintain the context information of the terminal device in the first network, so that when the terminal device switches back to the first network, the network connection of the terminal device in the first network can be quickly restored according to the stored context information of the terminal device, and service interruption can be avoided to a certain extent, thereby improving user experience.

It should be understood that, in the embodiment of the present application, the first network is restarted to use, which may also be referred to as returning the terminal device from the second network to the first network; stopping use of the first network and starting use of the second network may be referred to as the terminal device leaving the first network and entering the second network.

Optionally, in this embodiment of the present application, the terminal device may determine to switch from the first network to the second network when receiving a service from the second network while using the first network. For example, when the terminal device uses a first network for video service, and the second network receives voice service, in this case, the terminal device may determine to switch from the first network to the second network for voice service, that is, the terminal device stops using the first network and starts using the second network.

Optionally, in this embodiment of the application, the first indication information sent by the terminal device to the first access network device may include at least one of the following:

state information in the first network, such as an inactive state or a suspended state, desired by the terminal device;

the terminal equipment is switched to the second network for service transmission;

the terminal equipment switches to the information of the service transmitted by the second network;

the terminal equipment transmits the duration information of the service in the second network;

the terminal device expects the service information that the first network is paged.

By way of example and not limitation, the information of the service transmitted by the terminal device switching to the second network includes type information of the service and/or quality of service (QoS) information of the service.

By way of example and not limitation, the type information of the service includes at least one of:

voice services, short message services, emergency services, high priority services, low latency services, high reliability services, etc.

By way of example and not limitation, the QoS information for the traffic includes at least one of:

a 5G quality of service Indicator (5G QoS Indicator, 5QI), delay information, reliability information, throughput, etc.

Optionally, the service information that the terminal device desires to be paged by the first network may be type information of a service that is desired to be paged, such as a voice service, a short message service, an emergency service, a high priority service, and the like, or QoS information of a service, such as 5QI information, delay information, reliability information, and the like.

In some embodiments, the terminal device may send the first indication information directly to the first access network device. In other embodiments, the terminal device may send the first indication information to the first access network device through a core network device in the first network.

For example, the terminal device may first send the first indication information to a core network device, for example, an Access and Mobility Management Function (AMF), specifically, may send the first indication information through a message type of interaction between the core network and the terminal device, for example, a Non-Access Stratum (NAS) message, and further, the core network device forwards the received first indication information to the first Access network device.

Optionally, in this embodiment of the application, after receiving the first indication information, the first access network device may switch the state of the terminal device in the first network to an inactive state or a suspended state.

For example, the first access network device may send a first signaling, for example, Radio Resource Control (RRC) signaling, to the terminal device, and switch a state of the terminal device in the first network from an active state to an inactive state or a suspended state through the first signaling.

Optionally, in some embodiments, the first signaling may include at least one of:

time information;

second indication information, configured to indicate whether the terminal device needs to monitor a paging message of the first network in the inactive state or the suspended state;

and third indication information, configured to indicate whether a notification message needs to be sent to the network device in the first network when the terminal device is switched back to the first network.

Optionally, as an embodiment, the time information is time information that the terminal device remains in the inactive state.

For the terminal device, after receiving the first signaling including the time information, the terminal device may start a timer, where a duration of the timer may be a duration indicated by the time information, and when the timer is overtime, if the terminal device does not return to the first network, that is, does not resume using the first network, in this case, the terminal device releases the context information of the terminal device in the first network, and returns to an idle state.

For the first access network device, after sending the first signaling including the time information, the first access network device may also start a timer, and when the timer is overtime, if the first access network device does not return to the first network, for example, does not receive a notification message or an reachable (available) message that the terminal device returns to the first network, the first access network device releases the context information of the terminal device in the first network, which is locally stored. Optionally, the first access network device may also instruct the core network side, for example, the AMF, to also release the context information of the terminal device, and release the network connection of the terminal device in the first network, for example, the connection related to N2 and N3.

Optionally, as another embodiment, the time information is time information used by the terminal device to listen to a paging message in the first network.

For the terminal device, after receiving the first signaling including the time information, the terminal device may start a timer, before the timer expires, the terminal device does not monitor the paging message of the first network, and when the timer expires, the terminal device starts monitoring the paging message of the first network.

For the first access network device, after sending the first signaling including the time information, the first access network device may start a timer, during the running period of the timer, the first access network device considers that the terminal device is unreachable, and does not send the paging message, and when the timer times out, the first access network device considers that the terminal device is reachable, and sends the paging message.

In this embodiment of the present application, when the terminal device is kept in an inactive state or a suspended state, the terminal device may select to monitor the paging message in the first network, or may not monitor the paging message in the first network, or may monitor the paging message under a condition that a specific condition is met.

In this embodiment of the present application, when the terminal device is kept in an inactive state or a suspended state, a network device in the first network, for example, a first access network device or a core network device, may select to send a paging message, may select not to send a paging message, may select a type of a sent paging message, or may send a paging message when a specific condition is met.

In the following, without loss of generality, several specific embodiments according to the present application are described by taking a terminal device as a UE, a first Access Network device as a Radio Access Network (RAN), and a first core device as an AMF. It should be understood that the embodiments of the present application may also be applicable to other communication systems, for example, an Evolved Packet System (EPS), in which case, the AMF may be a Mobility Management Entity (MME), the User Plane Function (UPF) may be a Packet Data Network Gateway (PGW-U), the Session Management Function (SMF) may be a Serving Gateway (SGW), and the N2 and N3 interfaces may be an S1AP interface and an S1-U interface.

Fig. 3 is a schematic flow chart of a first embodiment of the present application, and as shown in fig. 3, the method 200 may include:

s201, UE determines to switch from a first network to a second network and determines to inform RAN;

for example, when the UE uses the first network for video service, the second network receives voice service, in which case the UE may determine to switch from the first network to the second network for voice service.

Further, in S202, the UE sends first indication information to the RAN, where the first indication information is used to inform the RAN that the UE is to be handed over from the first network to a second network;

optionally, in some embodiments, the first indication information may include at least one of the following information:

In some embodiments, the UE may send the first indication information directly to the RAN. In other embodiments, the UE may send the first indication information to the RAN through a core network device in the first network. For example, the UE may first send the first indication information to the core network device, for example, the AMF, for example, through NAS message sending, and further, after receiving the first indication information, the core network device sends the first indication information to the RAN.

In S203, after receiving the first indication information of the UE, the RAN determines to switch the UE to the inactive state according to the first indication information.

Optionally, in S204, the RAN may send a first signaling, for example, Radio Resource Control (RRC) signaling, to the UE, and switch a state of the UE in the first network from an active state to an inactive state through the first signaling.

Optionally, the first signaling may comprise at least one of:

time information;

For the meaning of the time information in the first signaling, the RAN and UE may perform the corresponding operations:

meaning 1: the time information is the time information that the UE remains in the inactive state.

For the UE, after receiving the first signaling including the time information, the UE may start a timer, where a duration of the timer may be a duration indicated by the time information, and when the timer is overtime, if the UE does not return to the first network, in this case, the UE releases the context information of the UE in the first network and returns to the idle state.

For the RAN, after sending the first signaling including the time information, the RAN may start a timer, and when the timer expires, if the UE does not return to the first network, for example, does not receive a notification message or an reachable (available) message that the UE returns to the first network, the RAN may release the context information of the UE in the first network, which is locally stored. Optionally, the RAN may instruct the AMF to also release the context information of the UE and release the network connection of the UE in the first network, e.g., the N2 and N3 related connections.

Meaning 2: the time information is time information used by the UE to monitor a paging message in a first network.

For the UE, after receiving the first signaling including the time information, the UE may start a timer, before the timer expires, the UE does not monitor the paging message of the first network, and when the timer expires, the UE starts monitoring the paging message of the first network.

For the RAN, after transmitting the first signaling including the time information, the RAN may start a timer during which the RAN considers the UE unreachable and does not transmit the paging message, and when the timer times out, the RAN considers the UE reachable and transmits the paging message.

S205, the UE maintains an inactive state in the first network.

S206, when the downlink data arrives, the UPF sends the received downlink data to the RAN.

S207, after receiving the downlink data, the RAN may determine whether it is necessary to send a paging message to the UE. The paging message here may be in the same format as an existing paging message.

Optionally, as an embodiment, after receiving the downlink data, the RAN may directly send the paging message to the UE without making a determination.

As another embodiment, after receiving the downlink data, the RAN may determine whether to send the paging message according to whether the UE returns to the first network. For example, if the RAN receives a notification message sent by the UE and returned to the first network, the RAN determines to send the paging message, and may further send the paging message to the UE. Alternatively, if the RAN does not receive the notification message sent by the UE and returned to the first network, the RAN determines not to send the paging message, and optionally, the RAN may also send a notification message that the UE is unreachable to a core network, for example, an AMF or a UPF.

Optionally, as a further embodiment, the RAN may also send the paging message according to the time information in the first signaling. For example, the RAN may not send the paging message of the first type during the timer running, and send the paging message when the timer times out.

If the RAN determines to send the paging message in S207, the RAN may further send the paging message to the UE.

For the UE, it may listen to the paging message in the first network, or may also determine whether to listen to the paging message in the first network according to the second indication information in the first signaling. For example, if the second indication information indicates that monitoring of the paging message in the first network is not required, the UE determines to monitor the paging message in the first network, otherwise, determines to monitor the paging message in the first network.

In S208, the UE monitors the paging message sent by the RAN, and further, the UE may determine whether to reply to the RAN with a paging response message.

Optionally, the UE may determine whether to reply to the paging response message according to the service information in the second network, the type of the received paging message, and attributes such as priorities of the first network and the second network.

For example, the UE may determine not to reply to a paging response message if the traffic transmission in the second network has not ended. Alternatively, the UE may determine whether to reply to the response paging message based on a timer, for example, during the running of the timer, it may consider that the service of the second network has not ended, and does not reply to the paging response message, and when the timer is overtime, it may consider that the service of the second network has ended, and then reply to the paging response message.

For another example, if the service priority in the second network is a high priority service, optionally, the priority of the high priority service is higher than a specific priority threshold, for example, an emergency call service, a voice service, etc., it is determined not to reply to the paging response message.

As another example, the service in the second network is a specific type of service, such as voice service, or emergency service, and it is determined not to reply to the page response message.

For another example, the priority of the service in the second network is higher than the priority of the downlink data to be transmitted, and it is determined not to reply to the paging response message.

For another example, the priority of the second network is higher than the priority of the first network, and it is determined not to reply to the page response message.

Optionally, in this embodiment of the present application, the priorities of the first network and the second network may be obtained according to subscription information of the UE, or configured by a network device, or set by a user of the UE, or agreed by a protocol.

Further, if the RAN receives a paging response message of the UE, the RAN may determine that the UE returns to the first network, and since the network connection of the UE in the first network is maintained and the context information of the UE is stored at the UE side, the access network side and the core network side, the UE may continue to use the previous network connection for service transmission in the first network.

Optionally, the RAN may switch the state of the UE in the first network from an inactive state to an active state.

Alternatively, if the RAN does not receive the paging response message of the UE in S209, and the RAN may consider that the UE is not reachable, the RAN may perform the following operations in S210:

mode 1: the RAN initiates a release procedure, locally releases the context of the UE, and releases the network connection of the UE, e.g., the connections of N2 and N3. Optionally, the RAN may also instruct the AMF and SMF to release the locally saved context of the UE. The RAN may also discard the received downlink data and switch the UE to an idle state.

Mode 2: the RAN, which initiates a release procedure to locally release the context of the UE and release the network connection of the UE, e.g., the connections of N2 and N3, may also instruct AMFs and SMFs to release the locally saved context of the UE. The RAN may also return the received downlink data to the UPF side.

Mode 3: the RAN keeps the UE in an inactive state. Optionally, the RAN may discard the buffered downlink data, or may also forward the buffered downlink data to the UPF side. Optionally, the RAN does not send paging messages to the UE until a notification message or an reachable message of the UE returning to the first network is not received. Optionally, the RAN may also start a timer, and before the timer expires, the RAN does not send a paging message to the UE.

Fig. 4 is a schematic flow chart of a second embodiment of the present application, and as shown in fig. 4, the method may include:

it should be understood that for the implementation of the similar steps in the second embodiment and the first embodiment, reference is made to the related description of the first embodiment.

S301, the UE determines to switch from a first network to a second network and determines that the RAN needs to be notified.

The S301 may correspond to S201 in the first embodiment shown in fig. 3, and specific implementation refers to the related description of the foregoing embodiments, which is not described herein again.

S302, the UE sends first indication information to the RAN, wherein the first indication information is used for informing the RAN that the UE is to be switched from a first network to a second network.

The S302 may correspond to S202 in the first embodiment shown in fig. 3, and specific implementation refers to the related description of the foregoing embodiments, which is not described herein again.

S303, after receiving the first indication information of the UE, the RAN determines to switch the UE to the inactive state according to the first indication information.

Optionally, in S304, the RAN may send a first signaling to the UE, and switch the state of the UE in the first network from an active state to an inactive state through the first signaling.

The S304 may correspond to S204 in the first embodiment shown in fig. 3, and specific implementation refers to the related description of the foregoing embodiments, which is not described herein again.

S305, the UE remains in an inactive state in the first network.

S306, when downlink data arrives, the UPF sends the received downlink data to the RAN.

S307, after receiving the downlink data, the RAN may determine whether to send a paging message to the UE.

Optionally, in some embodiments, the paging message includes service attribute information of the downlink data. Optionally, the service attribute information of the downlink data may include at least one of the following:

protocol Data Unit (PDU) Session (Session) information, e.g., PDU Session identification (identity, ID);

QoS Flow (Flow) information, e.g., QoS Flow ID;

data Radio Bearers (DRB) information, e.g., DRB ID;

5QI information of the downlink data.

For convenience of distinguishing and describing, in the embodiment of the present application, a paging message including service attribute information of downlink data is denoted as a second type paging message or an enhanced paging message (enhanced paging), a paging message not including the service attribute information of the downlink data is denoted as a first type paging message or a normal paging message (normal paging), a format of the first type paging message may be the same as that of an existing paging message, and the paging message in the first embodiment may be the first type paging message.

Optionally, the RAN may determine service attribute information of the downlink data according to the received downlink data, for example, determine a PDU Session of the downlink data according to N3 channel (Tunnel) information of the downlink data, determine a 5QI of the downlink data according to a QoS Flow Identifier (QFI) therein, and determine DRB information of the downlink data according to the PDU Session ID and/or QFI information of the downlink data.

Optionally, at S307, the RAN may determine whether to send the paging message, and further, may determine what type of paging message to send, for example, the aforementioned first type paging message or the second type paging message.

Optionally, the RAN may determine whether to send a paging message according to information such as whether the UE returns to the first network, time information in the first signaling, a service attribute of the downlink data, priorities of the first network and the second network, and service information that the first network is paged and is expected by the terminal device, or may also determine a type of the sent paging message.

For example, the RAN may determine whether to send a second type of paging message based on whether the UE is reachable, e.g., determine to send the second type of paging message when the UE is reachable, and otherwise, not send the second type of paging message.

Alternatively, the RAN may determine whether to send the first type paging message or the second type paging message according to whether the UE is reachable, for example, the RAN may send the second type paging message when the UE is not reachable, or send the first type paging message when the UE is reachable; alternatively, the RAN may send the first type of paging message when the UE is not reachable, or send the second type of paging message when the UE is reachable.

For another example, the RAN may also determine whether to send the second type paging message according to the time information in the first signaling. For example, the RAN may not send the second type paging message if the RAN considers that the UE is not reachable during the timer running period, and start sending the second type paging message if the RAN considers that the UE is reachable when the timer expires.

For another example, the RAN may also determine whether to send a paging message according to the service attribute information of the downlink data. For example, if the priority of the downlink data is higher than a specific priority threshold, or the downlink data is a specific type of service, such as a voice service or an emergency service, the RAN may determine to send a paging message, which may be a first type of paging message or a second type of paging message.

Further, the RAN may determine whether to send a second type paging message according to the service attribute information of the downlink data in combination with the service information, which is included in the first indication information and is expected by the terminal device, of the first network being paged.

Optionally, if the service information that the terminal device desires to be paged in the first network includes service information of the downlink data, for example, the downlink data is a voice service, the type of service that the terminal device desires to be paged in the first network includes a voice service, or if the delay requirement of the downlink data is higher than the delay information of the service that the terminal device desires to be paged, the RAN may determine to send a second type of paging message.

For another example, the RAN may determine whether to send the paging message according to the priorities of the first network and the second network, for example, if the priority of the first network is higher than the priority of the second network, the RAN determines to send the paging message, otherwise, the RAN does not send the paging message, where the paging message may be a first type paging message or a second type paging message. Or if the priority of the first network is higher than that of the second network, determining to send the second paging message, otherwise, sending the first paging message, or vice versa.

If the RAN determines to transmit the paging message in S307, the paging message may be further transmitted to the UE. Specifically, if it is determined to send the first type paging message, the RAN may send the first type paging message to the UE, or if it is determined to send the second type paging message, the RAN may send the second type paging message, that is, the paging message including the service attribute information of the downlink data, to the UE.

For the UE, it may listen to the paging message in the first network, or may also determine whether to listen to the paging message in the first network according to the second indication information in the first signaling. For example, if the second indication information indicates that the paging message in the first network does not need to be monitored, the UE monitors the paging message in the first network, otherwise, monitors the paging message in the first network.

In S308, the UE listens to the paging message sent by the RAN, where the paging message may be a first paging message or a second paging message, and further, the UE may determine whether to reply to the RAN with a paging response message.

Optionally, the UE may determine whether to reply to the paging response message according to the service information in the second network, the type of the received paging message, the service attribute information of the downlink data included in the paging message, the priorities of the first network and the second network, the service information of the terminal device in which the first network is paged, and other attributes.

For example, if the service transmission in the second network has not ended, the UE may determine not to reply to the paging response message. Alternatively, the UE may determine whether to reply to the response paging message based on a timer, for example, during the running of the timer, it may consider that the service of the second network has not ended, and does not reply to the paging response message, and when the timer is overtime, it may consider that the service of the second network has ended, and then reply to the paging response message.

For another example, if the service information of the first network paged expected by the terminal device does not include the service information of the downlink data to be transmitted, for example, the downlink data is a video service, and the service type of the first network paged expected by the terminal device does not include the video service, or if the delay requirement of the downlink data is lower than the delay information of the service expected to be paged by the terminal device, the terminal device may not reply the paging response message.

Optionally, the UE may also determine whether to respond to the paging message according to a type of the received paging message, for example, the first type paging message or the second type paging message, for example, if the received paging message is the first type paging message, the UE may determine to respond to the paging message, or if the received paging message is the second type paging message, the UE may determine to respond to the paging message.

Further, if the RAN receives a paging response message of the UE, the RAN may determine that the UE returns to the first network, and since the network connection of the UE in the first network is maintained and the context information of the UE is stored at the UE side, the access network side, and the core network side, the UE may continue to use the previous network connection for service transmission in the first network, which may avoid signaling overhead for reestablishing the network connection, and may avoid interruption of service transmission, thereby improving user experience.

Optionally, the RAN may switch the state of the UE in the first network from an inactive state to an active state after the UE returns to the first network.

Or, if the RAN does not receive the paging response message of the UE in S309, the RAN may consider the UE to be unreachable, and further, the RAN may perform corresponding operations in S310, it should be understood that S310 may correspond to S210 in the first embodiment shown in fig. 2, and specific implementation please refer to the related description of the first embodiment, which is not described herein again.

Fig. 5 is a schematic flow chart of a third embodiment of the present application, and as shown in fig. 5, the method may include:

s401, the UE determines to switch from a first network to a second network and determines that the RAN needs to be notified.

The S401 may correspond to S201 in the first embodiment shown in fig. 3, and specific implementation refers to the related description of the foregoing embodiments, which is not described herein again.

S402, the UE sends first indication information to the RAN, wherein the first indication information is used for informing the RAN that the UE is to be switched from a first network to a second network.

The content and meaning included in the first indication information refer to the related description of the foregoing embodiments, and are not repeated here.

Optionally, after receiving the first indication information, the RAN may send the first indication information to a core network, for example, an AMF. Specifically, the RAN may send the first indication information to the AMF during suspension of the UE.

Optionally, in other embodiments, the UE may also send the first indication information to the AMF, the AMF determines to switch the UE to the suspended state, and initiates a release procedure, where the AMF may instruct the RAN to switch the UE to the suspended state.

S403, after receiving the first indication information of the UE or receiving the UE suspend instruction of the AMF, the RAN switches the UE to the suspend state. Optionally, the RAN may release the RRC connection, N2 connection, and N3 connection of the UE.

Optionally, in S404, the RAN may send a first signaling, for example, an RRC signaling, to the UE, and switch the state of the UE in the first network from the active state to the suspended state through the first signaling.

Here, the information included in the first signaling may refer to the related description of the information included in the first signaling in S204 in the first embodiment shown in fig. 3, and is not described again here.

S405, the UE maintains a suspended state in the first network.

When the UE is in the suspended state, the UE may determine whether to monitor a paging message in the first network according to the second indication information in the first signaling, and determine whether to send a notification message to a network device in the first network when returning to the first network according to the third indication information in the first signaling.

S406-S407, when downlink data arrives, the UPF notifies the SMF, and further the SFM notifies the AMF, and optionally, the service attribute information of the downlink data is carried in the UPF, and the specific content of the service attribute information of the downlink data refers to the related description of the second embodiment shown in fig. 4, which is not described herein again.

S408, after receiving the downlink data, the AMF may determine whether it is necessary to send a paging message to the UE.

That is, in the third embodiment, the core network may determine the paging mechanism of the terminal device, for example, may determine whether to send the first type paging message, may determine whether to send the second type paging message, or may determine whether to send the first type paging message or the second type paging message.

Mode 1: the AMF determines whether to send a first type paging message;

optionally, the AMF may determine whether to send the first type paging message according to whether the UE returns to the first network, service information that the first network is paged and that the UE desires, priorities of the first network and the second network, a service attribute of the downlink data, and the like.

For example, when the UE is reachable, it is determined to send the first type paging message, otherwise, the first type paging message is not sent. Or, the AMF may send the first type paging message directly after receiving the downlink data without making a judgment; alternatively, the AMF may also determine whether to transmit the first type paging message based on a timer, for example, not transmit the first type paging message during the running of the timer, and transmit the first type paging message when the timer expires.

For another example, if the service attribute information of the downlink data is included in the service information that the UE desires to page the first network, for example, the downlink data is a voice service, and the type of service that the terminal device desires to page the first network includes the voice service, or if the delay requirement of the downlink data is higher than the delay information of the service that the terminal device desires to page, the AMF may determine to send the first type paging message, otherwise, not send the first type paging message.

Optionally, in the mode 1, the mode in which the AFM may determine the paging mechanism of the UE may also refer to an implementation mode in which the RAN performs paging message sending in the foregoing embodiment, which is not described herein again.

If the AMF determines to send the first paging message, in S409, the AMF may send a first paging request message to the RAN, and further, in S410, the RAN may send a first paging message to the UE. The first paging request message may be in the same format as an existing paging request message.

Mode 2: the AMF determining whether to transmit a second type paging message;

optionally, the AMF may determine whether to send the second type paging message according to at least one of whether to receive a notification message that the UE returns to the first network, priorities of the first network and the second network, service information that the first network is paged and is expected by the UE, service attribute information of the downlink data, and service information in the second network.

For example, if the AMF receives the notification message that the UE returns to the first network, the second paging message may be sent when the UE is reachable, or the second paging message may not be sent when the UE is not reachable.

For another example, the AMF may also determine whether to transmit the second type paging message according to a timer. For example, during the timer running period, the AMF may consider that the UE is not reachable, and does not send the second type paging message, and when the timer times out, the AMF may consider that the UE is reachable, and starts sending the second type paging message.

For another example, if the priority of the downlink data is higher than a specific priority threshold, or the downlink data is a specific type of service, such as a voice service or an emergency service, the AMF may determine to send the second type of paging message.

For another example, if the service attribute information of the downlink data is included in the service information that the UE desires to page the first network, for example, the downlink data is a voice service, and the type of service that the terminal device desires to page the first network includes the voice service, or if the delay requirement of the downlink data is higher than the delay information of the service that the terminal device desires to page, the AMF may determine to send the second type of paging message, otherwise, not send the second type of paging message.

For another example, the AMF may determine whether to send the second type of paging message according to priorities of the first network and the second network, for example, if the priority of the first network is higher than the priority of the second network, the AMF determines to send the second type of paging message, otherwise, the AMF does not send the second type of paging message, or vice versa.

If the AMF determines to send the second type paging message, the AMF may send a second type paging request message to the RAN in S412, and further, the RAN may send a second type paging message to the UE in S413. Different from the first paging request message, the second paging request message may include service attribute information of the downlink data, that is, the paging request message may be an enhanced paging request message.

Mode 3: the AMF may determine a type of a transmitted paging message.

Optionally, the AMF may determine to send the first type paging message or the second type paging message according to whether a notification message that the UE returns to the first network is received, priorities of the first network and the second network, service information that the first network is paged and that the UE desires, at least one of service attribute information of the downlink data and service information in the second network.

For example, if the UE is not reachable, it is determined to send the second type paging message, or when the UE is reachable, the first type paging message is sent. Or if the UE is reachable, determining to send the first paging message, or when the UE is not reachable, sending the second paging message.

For another example, if the priority of the downlink data is higher than a specific high priority threshold, or the downlink data is a specific type of service, such as a voice service or an emergency service, the AMF may determine to send the first type of paging message, otherwise, determine to send the second type of paging message, or vice versa.

In the mode 3, the sending modes of the first paging message and the second paging message may refer to the related descriptions of S409 to S413, which are not described herein again.

For mode 1, if the UE monitors the first type paging message sent by the RAN, further in S411, the UE may determine whether to reply a paging response message to the RAN.

For mode 2, if the UE monitors the second type paging message sent by the RAN, further in S412, the UE may determine whether to reply to the RAN with a paging response message.

As for mode 3, when the UE can monitor the first paging message or the second paging message, it further determines whether the RAN replies to the paging response message.

Optionally, the UE may determine whether to reply to the paging response message according to the service information in the second network, the type of the received paging message, the service information that the UE desires the first network to be paged, the priority of the first network and the second network, and other attributes.

For example, if the service transmission in the second network has not ended, the UE may determine not to reply to the paging response message. Alternatively, the UE may determine whether to reply to the response paging message based on a timer, for example, during the running of the timer, the UE may consider that the service of the second network has not ended, does not reply to the paging response message, and when the timer expires, the UE may consider that the service of the second network has ended, and then replies to the paging response message.

For another example, if the received paging message is the first type paging message, the UE may determine to respond to the paging message, or if the received paging message is the second type paging message, the UE may determine to respond to the paging message, or vice versa.

Further, if the AMF receives a paging response message of the UE, the AMF may determine that the UE returns to the first network, and since the context information of the UE is stored in the UE side, the access network side, and the core network side, the UE may quickly recover the network connection in the first network, thereby continuing to use the first network for service transmission.

Optionally, after the UE returns to the first network, the AMF may instruct the RAN to switch the state of the UE in the first network from a suspended state to an activated state.

Alternatively, if the AMF does not receive the paging response message of the UE in S415, the UE may be considered to be unreachable, and further, the AMF may perform a corresponding operation in S316.

Mode 1: the AMF initiates a detach procedure of the UE.

Mode 2: the AMF initiates a release process, releases the context information of the UE stored locally, instructs the RAN to release the context information of the UE, instructs the SMF to release the context information of the UE, and switches the UE to an idle state.

Mode 3: context information of the UE is saved. Further, the AMF does not send paging messages to the UE until the UE is reachable. Or the AMF may start a timer, and before the timer expires, the AMF does not transmit a paging message to the UE.

Fig. 6 is a schematic flow chart of a fourth embodiment of the present application, and as shown in fig. 6, the method may include:

s501, the UE determines to switch from a first network to a second network and determines that the RAN needs to be notified.

The S501 may correspond to S201 in the first embodiment shown in fig. 3, and specific implementation refers to the related description of the foregoing embodiments, which is not described herein again.

S502, the UE sends first indication information to the RAN, where the first indication information is used to notify the RAN that the UE is to be handed over from the first network to the second network.

The S502 may correspond to S202 in the first embodiment shown in fig. 3, and specific implementation refers to the related description of the foregoing embodiments, which is not described herein again.

S503, after receiving the first indication information of the UE, the RAN determines to switch the UE to a suspended state according to the first indication information, and releases the RRC connection, the N2 connection and the N3 connection of the UE.

Similar to S203, the UE may also forward the first indication information to the RAN through a core network device, such as an AMF, and after receiving the first indication information, the AMF may send the first indication information to the RAN.

Optionally, in S504, the RAN may send a first signaling, for example, an RRC signaling, to the UE, and switch the state of the UE in the first network from the active state to the suspended state through the first signaling.

Here, the information included in the first signaling may refer to specific description of the information included in the first signaling in S204 in the first embodiment shown in fig. 3, and is not described again here.

S505, the UE maintains a suspended state in the first network.

S506-S507, when downlink data arrives, the UPF notifies the SMF, and further the SFM notifies the AMF, and optionally, the service attribute information of the downlink data is carried in the UPF, and specific contents refer to the related description in the second embodiment shown in fig. 4, which is not described herein again.

After receiving the downlink data, the AMF may send a paging request message to the RAN, where the paging request message may be the foregoing first type paging request message or the second type paging request message, where the second type paging request message includes service attribute information of the downlink data.

Mode 1:

s508, after receiving the downlink data, the AMF sends a first paging request message to the RAN.

S509, the RAN determines whether to send a first type paging message.

Optionally, the RAN may determine whether to send the first type paging message according to whether the UE returns to the first network, service information that the UE desires the first network to be paged, priorities of the first network and the second network, a service attribute of the downlink data, and the like.

For example, when the UE is reachable, it is determined to send the first type paging message, otherwise, the first type paging message is not sent. Alternatively, the RAN may also determine whether to send the first type paging message based on a timer, e.g., not send the first type paging message during timer running, and send the first type paging message when the timer times out.

For another example, if the service attribute information of the downlink data is included in the service information that the UE desires to page the first network, for example, the downlink data is a voice service, the type of service that the terminal device desires to page the first network includes the voice service, or if the delay requirement of the downlink data is higher than the delay information of the service that the terminal device desires to page, the RAN may determine to send the first type paging message, otherwise, not send the first type paging message.

Optionally, in the manner 1, the RAN may determine the paging mechanism of the UE, and refer to the implementation manners of sending the paging message by the RAN in the first embodiment and the second embodiment, which are not described herein again.

If the RAN determines to send the first type paging message, in S510, the RAN sends the first type paging message to the UE, and further, in S511, the UE may receive the first type paging message, and further determine whether to send a paging response message.

Mode 2:

s512, after receiving the downlink data, the AMF sends a second paging request message to the RAN.

S513, the RAN determines whether to transmit the paging message and/or the type of the transmitted paging message.

Mode 2.1: the RAN determining whether to send a first type paging message;

for the specific implementation of the mode 2.1, reference may be made to the specific implementation of S509, which is not described herein again.

Mode 2.2: the RAN may determine whether to send a second type of paging message;

optionally, the RAN may determine whether to send the second type paging message according to at least one of whether to receive a notification message that the UE returns to the first network, priorities of the first network and the second network, service information that the UE desires that the first network is paged, service attribute information of the downlink data, and service information in the second network.

For example, if the RAN receives a notification message that the UE returns to the first network, the RAN may send the second type paging message when the UE is reachable, or may not send the second type paging message when the UE is not reachable.

Also for example, the RAN may determine whether to send the paging message of the second type based on a timer. For example, during the timer running, the RAN may consider the UE not to be reachable, and does not send the second type paging message, and when the timer times out, the RAN may consider the UE to be reachable, and starts sending the second type paging message.

For another example, if the priority of the downlink data is higher than a specific priority threshold, or the downlink data is a specific type of service, such as a voice service or an emergency service, the RAN may determine to send the second type of paging message.

For another example, if the service attribute information of the downlink data is included in the service information that the UE desires to page the first network, for example, the downlink data is a voice service, the type of service that the terminal device desires to page the first network includes the voice service, or if the delay requirement of the downlink data is higher than the delay information of the service that the terminal device desires to page, the RAN may determine to send the second type paging message, otherwise, not send the second type paging message.

For another example, the RAN may determine whether to send the second type of paging message according to the priorities of the first network and the second network, for example, if the priority of the first network is higher than the priority of the second network, the RAN determines to send the second type of paging message, otherwise, the RAN does not send the second type of paging message, or vice versa. Mode 2.3: the RAN may determine the type of paging message sent.

Optionally, the RAN may determine to send the first type paging message or the second type paging message according to whether a notification message that the UE returns to the first network is received, priorities of the first network and the second network, service information that the UE desires that the first network is paged, at least one of service attribute information of the downlink data and service information in the second network.

For another example, if the priority of the downlink data is higher than a specific high priority threshold, or the downlink data is a specific type of service, such as a voice service or an emergency service, the RAN may determine to send the first type of paging message, otherwise, determine to send the second type of paging message, or vice versa.

In mode 2, if the RAN determines to send the first type paging message, in S514, the RAN sends the first type paging message to the UE, and further, in S515, the UE may receive the first type paging message and further determine whether to send a paging response message. Or if the RAN determines to send the second type paging message, in S516, the RAN sends the second type paging message to the UE, and further, in S517, the UE receives the second type paging message, and further determines whether to send a paging response message.

Hereinafter, specific implementations of S515 and S517 are described.

Further, if the RAN receives a paging response message of the UE, the RAN may determine that the UE returns to the first network, and since the context information of the UE is stored in the UE side, the access network side, and the core network side, the UE may quickly recover the network connection in the first network, thereby continuing to use the first network for service transmission.

Optionally, after the UE returns to the first network, the RAN may switch a state of the UE in the first network from a suspended state to an activated state.

Alternatively, if the RAN does not receive the paging response message of the UE in S518, the UE may be considered to be unreachable, and further, the RAN may perform a corresponding operation in S519.

Mode 1: and the RAN initiates a release process, locally releases the context of the UE and switches the UE to an idle state. Optionally, the AMF may detach the UE, e.g., the RAN may instruct the AMF to detach the UE.

Mode 2: the RAN maintains the context of the UE and indicates to the AMF, which also maintains the context of the UE. No paging message is sent until the UE is reachable. Optionally, the RAN does not send paging messages to the UE until a notification message or an reachable message of the UE returning to the first network is not received. Optionally, the RAN may also start a timer, and before the timer expires, the RAN does not send a paging message to the UE.

Therefore, according to the method for wireless communication in the embodiment of the present application, when a terminal device is to be switched from a first network to a second network, the terminal device may send indication information to a network device in the first network, indicating that the terminal device is to be switched from the first network to the second network, and further, the network device in the first network may switch the state of the terminal device in the first network from an active state to an inactive state or a suspended state, so that when the terminal device is switched back to the first network, traffic transmission may be performed according to a network connection that is established before, or the network connection of the terminal device in the first network may be quickly resumed, which is beneficial to avoiding interruption of traffic transmission in the first network, and thus user experience may be improved.

While method embodiments according to embodiments of the present application are described above in conjunction with fig. 2-6 from the perspective of device interaction, apparatus embodiments of the present application are described in detail below in conjunction with fig. 7-12, it being understood that apparatus embodiments correspond to method embodiments and that similar descriptions may be had with reference to method embodiments.

Fig. 7 shows a schematic block diagram of a terminal device 700 according to an embodiment of the application. As shown in fig. 4, the terminal device 700 includes:

a communication module 710, configured to send first indication information to a first network device, where the first indication information is used to indicate that the terminal device is to be handed over from a first network or system to a second network or system, where the first network device is an access network device or a core network device in the first network or system.

Optionally, in some embodiments, the first indication information comprises at least one of:

the state information of the terminal device in the first network or system is expected, the information of the terminal device switched to the second network or system for service transmission is switched to, the information of the terminal device switched to the service transmitted by the second network or system is switched to, the time length information of the terminal device in the second network or system for service transmission is expected, and the information of the service paged by the first network is expected by the terminal device.

Optionally, in some embodiments, the information of the service transmitted by the terminal device to switch to the second network or system includes type information of the service and/or quality of service QoS information of the service; the service information that the terminal device desires to be paged by the first network may be type information of the service that the terminal device desires to be paged and/or QoS information of the service.

Optionally, in some embodiments, the type information of the service includes at least one of:

voice service, short message service, emergency service, high priority service.

Optionally, in some embodiments, the QoS information of the traffic comprises at least one of:

5G service quality indication 5QI, time delay information and reliability information.

Optionally, in some embodiments, if the first network device is an access network device in the first network or the system, the communication module is specifically configured to:

and sending the first indication information to the first network equipment through first core network equipment, wherein the first core network equipment is core network equipment in the first network or the system.

Optionally, in some embodiments, if the first network device is an access network device in the first network or system, the communication module is further configured to:

the terminal device receives a first signaling sent by the first network device, wherein the first signaling is used for switching the state of the terminal device in the first network or system from an active state to an inactive state or a suspended state.

Optionally, in some embodiments, if the state of the terminal device is an inactive state, the terminal device maintains network connections with a core network side and an access network side in the first network or system, and the core network side and the access network side of the first network or system and the terminal device side both maintain context information of the terminal device in the first network or system; or

And if the state of the terminal equipment is a suspended state, the terminal equipment releases network connection with a core network side and an access network side in the first network or system, and the core network side and the access network side of the first network or system and the terminal equipment side keep the context information of the terminal equipment in the first network or system.

Optionally, in some embodiments, the first signaling comprises at least one of the following information:

time information;

second indication information, configured to indicate whether the terminal device needs to monitor a paging message of the first network or system in the inactive state or the suspended state;

and third indication information, configured to indicate whether a notification message needs to be sent to a network device in the first network or system when the terminal device is switched back to the first network or system.

Optionally, in some embodiments, the time information is time information that the terminal device remains in the inactive state or the suspended state.

Optionally, in some embodiments, the terminal device further includes:

the processing module is used for starting a first timer according to the time information;

and if the first timer is timed out, the terminal equipment does not return to the first network or system, releasing the context information of the terminal equipment in the first network or system, and switching the state of the terminal equipment in the first network or system to an idle state.

Optionally, in some embodiments, the time information is time information used by the terminal device to listen to a paging message.

Optionally, in some embodiments, the terminal device further includes:

the processing module is used for starting a second timer according to the time information;

the communication module is further configured to: and starting to monitor the paging message of the first network or system when the second timer is timed out.

Optionally, in some embodiments, the terminal device further includes:

and the determining module is used for determining whether to monitor the paging message in the first network or system according to the second indication information.

Optionally, in some embodiments, the terminal device further includes

And the determining module is used for determining whether to send a notification message to the first network device according to the third indication information if the terminal device is switched back to the first network or the system.

Optionally, in some embodiments, the communication module is further configured to:

and receiving a paging message sent by the first network equipment.

Optionally, in some embodiments, the type of the paging message is a first type paging message or a second type paging message, where the second type paging message includes attribute information of downlink data to be transmitted.

Optionally, in some embodiments, the service attribute information of the downlink data includes at least one of:

protocol data unit PDU session information, QoS flow information, data radio bearer DRB information, and 5QI information of the downlink data.

Optionally, in some embodiments, the terminal device further includes:

a determining module, configured to determine whether to reply to the first network device with a page response message.

Optionally, in some embodiments, the determining module is specifically configured to:

determining whether to reply to the page response message according to at least one of:

service information in the second network or system, type information of the paging message, service attribute information of the downlink data in the paging message, and priorities of the first network or system and the second network or system.

if the service transmission of the terminal equipment in the second network or the system is not finished, determining not to reply the paging response message; or

And if the priority of the service of the terminal equipment in the second network or the system is higher than a specific priority threshold, determining not to reply the paging response message.

if the paging message is the second paging message, determining to reply the paging response message; or

And if the paging message is the first paging message, determining to reply the paging response message.

if the priority of the service of the terminal equipment in the second network or the system is higher than the priority of the downlink data, determining not to reply the paging response message; or

And if the priority of the second network or system is higher than that of the first network or system, determining not to reply the paging response message.

Optionally, in some embodiments, the priorities of the first network or system and the second network or system are determined according to subscription information of the terminal device, or are configured by the network, or are preconfigured.

Optionally, the multiple networks are networks corresponding to multiple systems supported by the terminal device.

It should be understood that the terminal device 700 according to the embodiment of the present application may correspond to a terminal device or a UE in the method embodiment of the present application, and the above and other operations and/or functions of each unit in the terminal device 700 are respectively for implementing corresponding processes of the terminal device in the method embodiments shown in fig. 2 to fig. 6, and are not described herein again for brevity.

Fig. 8 is a schematic block diagram of an access network apparatus according to an embodiment of the present application. The access network apparatus 800 shown in fig. 8 includes:

a communication module 810, configured to receive first indication information sent by a terminal device, where the first indication information is used to indicate that the terminal device is to be switched from a first network or system to a second network or system, and the access network device is an access network device in the first network or system;

a processing module 820, configured to switch the state of the terminal device in the first network or system from an active state to an inactive state or a suspended state.

Optionally, in some embodiments, the information of the service performed by the terminal device to switch to the second network or system includes type information of the service and/or quality of service QoS information of the service, and the service information that the terminal device desires to be paged by the first network may be the type information of the service that is desired to be paged and/or the QoS information of the service.

voice service, short message service, emergency service, high priority service.

Optionally, in some embodiments, the communication module is specifically configured to:

and receiving the first indication information sent by the terminal device through a first core network device, where the first core network device is a core network device in the first network or system.

and sending a first signaling to the terminal device, wherein the first signaling is used for switching the state of the terminal device in the first network or system from an active state to an inactive state or a suspended state.

time information;

Optionally, in some embodiments, the processing module is further configured to:

starting a third timer according to the time information;

if the third timer is timed out, the notification message that the terminal device switches back to the first network or system is not received, and the terminal device is in an inactive state, the context information of the terminal device in the first network or system is released, and the network connection of the terminal device at the access network side and the core network side in the first network or system is released; or

And if the third timer is overtime, the notification message that the terminal equipment is switched back to the first network or the first system is not received, and the terminal equipment is in a suspended state, and the context information of the terminal equipment in the first network or the first system is released.

it is determined whether to send a paging message to the terminal device and/or the type of paging message sent.

Optionally, in some embodiments, the processing module is specifically configured to: determining whether to transmit the paging message and/or a type of the transmitted paging message according to at least one of:

time information in the first signaling;

whether a notification message sent by the terminal equipment and returned to the first network or system is received;

attribute information of downlink data to be transmitted in the first network or system.

Optionally, in some embodiments, the type of the paging message includes a first type paging message and a second type paging message, where the second type paging message includes attribute information of downlink data to be transmitted.

Optionally, in some embodiments, the processing module is specifically configured to:

if the notification message sent by the terminal equipment is not received, determining not to send the first paging message; or

And if the notification message sent by the terminal equipment is received, determining to send the first paging message.

if the notification message sent by the terminal equipment is not received, determining not to send the second paging message; or

And if the notification message sent by the terminal equipment is received, determining to send the second paging message.

before the fourth timer is overtime, determining to send the second paging message; or

And when the fourth timer is overtime, determining to send the first paging message, wherein the duration of the fourth timer is determined according to the time information.

if the priority of the downlink data to be transmitted is higher than a specific priority threshold, determining to send the second paging message; or

And if the priority of the downlink data to be transmitted is higher than a specific priority threshold, determining to send the first paging message.

receiving a paging request message sent by a first core network device, where the paging request message is used to instruct the access network device to initiate a paging message to the terminal device, and the first core network device is a core network device in the first network or system.

Optionally, in some embodiments, the paging request message is a first-type paging request message or a second-type paging request message, where the second-type paging request message includes attribute information of the downlink data to be transmitted.

Optionally, in some embodiments, the first core network device is an access management function AMF entity or a mobility management network element MME.

and if the state of the terminal equipment in the first network or the first system is a non-activated state and the paging response message replied by the terminal equipment is not received, releasing the context information of the terminal equipment in the first network or the first system and releasing the connection of the core network side of the terminal equipment.

and if the state of the terminal equipment in the first network or the first system is a suspended state and the paging response message replied by the terminal equipment is not received, releasing the context information of the terminal equipment in the first network or the first system.

and instructing the core network equipment of the first network or system to release the context information of the terminal equipment in the first network or system.

the access network equipment transmits the cached downlink data back to a User Plane Function (UPF) entity of the first network or the first system;

the processing module is further configured to: and discarding the downlink data.

and if the access network equipment does not receive the paging response message replied by the terminal equipment, the access network equipment keeps the state of the terminal equipment in the first network or system in an inactive state or a suspended state.

It should be understood that the access network device 800 according to the embodiment of the present application may correspond to the first access network device in the embodiment of the method of the present application, and the above and other operations and/or functions of each unit in the access network device 800 are respectively for implementing corresponding processes of the first access network device in the embodiment of the method shown in fig. 3 to fig. 6, and are not described herein again for brevity.

Fig. 9 is a schematic block diagram of a core network device according to an embodiment of the present application. The core network apparatus 900 of fig. 9 includes:

a communication module 910, configured to receive first indication information sent by a terminal device, where the first indication information is used to indicate that the terminal device is to be switched from a first network or system to a second network or system, and the core network device is a core network device in the first network or system.

Optionally, in some embodiments, the information of the service transmitted by the terminal device to switch to the second network or system includes type information of the service and/or quality of service QoS information of the service;

the service information that the terminal device desires to be paged by the first network may be type information of the service that the terminal device desires to be paged and/or QoS information of the service.

voice service, short message service, emergency service, high priority service.

Optionally, in some embodiments, the communication module is further configured to

And sending indication information to a first access network device, wherein the first access network device is an access network device in the first network or system, and the indication information is used for the first access network device to switch the state of the terminal device in the first network or system from an active state to an inactive state or a suspended state.

Optionally, in some embodiments, the core network device further includes:

the determining module is used for determining whether to send the paging message to the terminal equipment and/or the type of the sent paging message.

determining whether to transmit the paging message and/or a type of the transmitted paging message according to at least one of:

Optionally, in some embodiments, the determining module is further configured to:

Optionally, in some embodiments, the core network device further includes:

and the processing module is used for initiating a detach process if the paging response message replied by the terminal equipment is not received.

Optionally, in some embodiments, the core network device further includes:

and the processing module is used for releasing the context information of the terminal equipment in the first network or system and indicating the access network equipment of the first network or system to release the context information of the terminal equipment in the first network or system if the paging response message replied by the terminal equipment is not received.

Optionally, in some embodiments, the core network device further includes:

and the processing module is used for keeping the context information of the terminal equipment in the first network or the system if the paging response message replied by the terminal equipment is not received.

Optionally, in some embodiments, the communication module is further configured to: and sending a paging request message to the first access network equipment, wherein the paging request message is used for indicating the first access network equipment to initiate a paging message to the terminal equipment.

Optionally, in some embodiments, the paging request message is a first-type paging request message or a second-type paging request message, where the second-type paging request message includes attribute information of downlink data to be transmitted.

Optionally, in some embodiments, the core network device is an access management function AMF entity or a mobility management network element MME.

It should be understood that the core network device 900 according to the embodiment of the present application may correspond to the first core network device or the AMF in the embodiment of the method of the present application, and the above and other operations and/or functions of each unit in the core network device 900 are respectively for implementing corresponding processes of the core network device in the embodiment of the method shown in fig. 3 to fig. 6, and are not described again here for brevity.

Fig. 10 is a schematic structural diagram of a communication device 600 according to an embodiment of the present application. The communication device 600 shown in fig. 10 includes a processor 610, and the processor 610 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 10, the communication device 600 may further include a memory 620. From the memory 620, the processor 610 may call and run a computer program to implement the method in the embodiment of the present application.

The memory 620 may be a separate device from the processor 610, or may be integrated into the processor 610.

Optionally, as shown in fig. 6, the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices, and specifically, may transmit information or data to the other devices or receive information or data transmitted by the other devices.

The transceiver 630 may include a transmitter and a receiver, among others. The transceiver 630 may further include one or more antennas.

Optionally, the communication device 600 may specifically be a network device in the embodiment of the present application, and the communication device 600 may implement a corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the communication device 600 may specifically be a mobile terminal/terminal device in this embodiment, and the communication device 600 may implement a corresponding process implemented by the mobile terminal/terminal device in each method in this embodiment, which is not described herein again for brevity.

Fig. 11 is a schematic structural diagram of a chip of an embodiment of the present application. The chip 1100 shown in fig. 11 includes a processor 1110, and the processor 1110 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 11, the chip 1100 may further include a memory 1120. From the memory 1120, the processor 1110 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 1120 may be a separate device from the processor 1110, or may be integrated into the processor 1110.

Optionally, the chip 1100 may also include an input interface 1130. The processor 1110 may control the input interface 1130 to communicate with other devices or chips, and in particular, may obtain information or data sent by other devices or chips.

Optionally, the chip 1100 may further include an output interface 1140. The processor 1110 may control the output interface 1140 to communicate with other devices or chips, and in particular, may output information or data to the other devices or chips.

Optionally, the chip may be applied to the network device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the chip may be applied to the mobile terminal/terminal device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, and for brevity, no further description is given here.

It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as a system-on-chip, a system-on-chip or a system-on-chip, etc.

Fig. 12 is a schematic block diagram of a communication system 1200 provided in an embodiment of the present application. As shown in fig. 12, the communication system 1200 includes a terminal device 1210, an access network device 1220, and a core network device 1230.

The terminal device 1210 may be configured to implement corresponding functions implemented by the terminal device in the foregoing method, and the access network device 1220 may be configured to implement corresponding functions implemented by the access network device in the foregoing method, and the core network device 1230 may be configured to implement corresponding functions implemented by the core network device in the foregoing method, which is not described herein again for brevity.

It should be understood that the processor of the embodiments of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (DDR SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchronous link SDRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that the above memories are exemplary but not limiting illustrations, for example, the memories in the embodiments of the present application may also be Static Random Access Memory (SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (enhanced SDRAM, ESDRAM), Synchronous Link DRAM (SLDRAM), Direct Rambus RAM (DR RAM), and the like. That is, the memory in the embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

The embodiment of the application also provides a computer readable storage medium for storing the computer program.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the computer-readable storage medium may be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

Embodiments of the present application also provide a computer program product comprising computer program instructions.

Optionally, the computer program product may be applied to the network device in the embodiment of the present application, and the computer program instructions enable the computer to execute corresponding processes implemented by the network device in the methods in the embodiment of the present application, which are not described herein again for brevity.

Optionally, the computer program product may be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the mobile terminal/terminal device in the methods in the embodiment of the present application, which are not described herein again for brevity.

The embodiment of the application also provides a computer program.

Optionally, the computer program may be applied to the network device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the computer program may be applied to the mobile terminal/terminal device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A method of wireless communication, comprising:

the method comprises the steps that a terminal device sends first indication information to a first network device, wherein the first indication information is used for indicating that the terminal device is to be switched from a first network or a system to a second network or the system, and the first network device is an access network device or a core network device in the first network or the system.
The method of claim 1, wherein the first indication information comprises at least one of:

the state information of the terminal device in the first network or system is expected, the information of the terminal device switched to the second network or system for service transmission is switched to, the information of the terminal device switched to the service transmitted by the second network or system is switched to, the time length information of the terminal device in the second network or system for service transmission is expected, and the information of the service paged by the first network is expected by the terminal device.
The method according to claim 2, wherein the information of the traffic transmitted by the terminal device to handover to the second network or system comprises type information of the traffic and/or quality of service (QoS) information of the traffic;

the service information that the terminal device desires to be paged by the first network may be type information of the service that the terminal device desires to be paged and/or QoS information of the service.
The method of claim 3, wherein the type information of the service comprises at least one of the following: voice service, short message service, emergency service, high priority service.
The method according to claim 3 or 4, wherein the QoS information of the traffic comprises at least one of the following:

5G service quality indication 5QI, time delay information and reliability information.
The method according to any one of claims 1 to 5, wherein if the first network device is an access network device in the first network or system, the sending, by the terminal device, the first indication information to the first network device includes:

and the terminal equipment sends the first indication information to the first network equipment through first core network equipment, wherein the first core network equipment is the core network equipment in the first network or the system.
The method according to any of claims 1 to 6, wherein if the first network device is an access network device in the first network or system, the method further comprises:

the terminal device receives a first signaling sent by the first network device, wherein the first signaling is used for switching the state of the terminal device in the first network or system from an active state to an inactive state or a suspended state.
The method according to claim 7, wherein if the state of the terminal device is an inactive state, the terminal device maintains network connections with a core network side and an access network side in the first network or system, and the core network side and the access network side of the first network or system and the terminal device side both maintain context information of the terminal device in the first network or system; or

And if the state of the terminal equipment is a suspended state, the terminal equipment releases network connection with a core network side and an access network side in the first network or system, and the core network side and the access network side of the first network or system and the terminal equipment side keep the context information of the terminal equipment in the first network or system.
The method according to claim 7 or 8, characterized in that the first signaling comprises at least one of the following information:

time information;

second indication information, configured to indicate whether the terminal device needs to monitor a paging message of the first network or system in the inactive state or the suspended state;

and third indication information, configured to indicate whether a notification message needs to be sent to a network device in the first network or system when the terminal device is switched back to the first network or system.
The method according to claim 9, wherein the time information is time information that the terminal device remains in the inactive state or the suspend state.
The method of claim 10, further comprising:

the terminal equipment starts a first timer according to the time information;

if the first timer is over time, the terminal device does not return to the first network or system, the terminal device releases the context information of the terminal device in the first network or system, and switches the state of the terminal device in the first network or system to an idle state.
The method of claim 9, wherein the time information is time information used by the terminal device to listen for a paging message.
The method of claim 12, further comprising:

the terminal equipment starts a second timer according to the time information;

and when the second timer is over, the terminal equipment starts to monitor the paging message of the first network or system.
The method according to any one of claims 9 to 12, further comprising:

and the terminal equipment determines whether to monitor the paging message in the first network or the system according to the second indication information.
The method according to any one of claims 9 to 14, further comprising:

and if the terminal equipment returns to the first network or the system, the terminal equipment determines whether to send a notification message to the first network equipment according to the third indication information.
The method according to any one of claims 1 to 15, further comprising:

and the terminal equipment receives the paging message sent by the first network equipment.
The method of claim 16, wherein the type of the paging message is a first type paging message or a second type paging message, and wherein the second type paging message includes attribute information of downlink data to be transmitted.
The method of claim 17, wherein the service attribute information of the downlink data comprises at least one of:

protocol data unit PDU session information, QoS flow information, data radio bearer DRB information, and 5QI information of the downlink data.
The method according to claim 17 or 18, further comprising:

the terminal device determines whether to reply a paging response message to the first network device.
The method of claim 19, wherein the determining, by the terminal device, whether to reply to the first network device with a page response message comprises:

the terminal equipment determines whether to reply a paging response message according to at least one of the following items:

service information in the second network or system, type information of the paging message, service attribute information of the downlink data in the paging message, and priorities of the first network or system and the second network or system.
The method of claim 20, wherein the terminal device determines whether to reply to the page response message according to at least one of: the service information in the second network or system, the type information of the paging message, the service attribute information of the downlink data in the paging message, and the priorities of the first network or system and the second network or system include:

if the service transmission of the terminal equipment in the second network or the system is not finished, the terminal equipment determines not to reply the paging response message; or

And if the priority of the service of the terminal equipment in the second network or the system is higher than a specific priority threshold, the terminal equipment determines not to reply the paging response message.
The method of claim 20, wherein the terminal device determines whether to reply to the page response message according to at least one of: the service information in the second network or system, the type information of the paging message, the service attribute information of the downlink data in the paging message, and the priorities of the first network or system and the second network or system include:

if the paging message is the second paging message, the terminal equipment determines to reply the paging response message; or

And if the paging message is the first paging message, the terminal equipment determines to reply the paging response message.
The method of claim 20, wherein the terminal device determines whether to reply to the page response message according to at least one of: the service information in the second network or system, the type information of the paging message, the service attribute information of the downlink data in the paging message, and the priorities of the first network or system and the second network or system include:

if the priority of the service of the terminal equipment in the second network or the system is higher than the priority of the downlink data, the terminal equipment determines not to reply the paging response message; or

And if the priority of the second network or the second network is higher than that of the first network or the first network, the terminal equipment determines not to reply the paging response message.
The method according to any of claims 20 to 23, wherein the priorities of the first network or system and the second network or system are determined from subscription information of the terminal device, or are configured by a network device, or are pre-configured.
The method according to any one of claims 1 to 24, wherein the first network or system and the second network or system are networks or systems corresponding to a plurality of systems supported by the terminal device.
A method of wireless communication, comprising:

a first access network device receives first indication information sent by a terminal device, wherein the first indication information is used for indicating that the terminal device is to stop using a first network or system, and the first access network device is an access network device in the first network or system;

and the first access network equipment switches the state of the terminal equipment in the first network or system from an active state to an inactive state or a suspended state.
The method of claim 26, wherein the first indication information comprises at least one of:

the state information of the terminal device in the first network or system is expected, the information of the terminal device switched to the second network or system for service transmission is switched to, the information of the terminal device switched to the service transmitted by the second network or system is switched to, the time length information of the terminal device in the second network or system for service transmission is expected, and the information of the service paged by the first network is expected by the terminal device.
The method according to claim 27, wherein the information of the service executed by the terminal device to handover to the second network or system comprises type information of the service and/or quality of service (QoS) information of the service;

the service information that the terminal device desires to be paged by the first network may be type information of the service that the terminal device desires to be paged and/or QoS information of the service.
The method of claim 28, wherein the type information of the service comprises at least one of the following:

voice service, short message service, emergency service, high priority service.
The method according to claim 28 or 29, wherein the QoS information of the traffic comprises at least one of:

5G service quality indication 5QI, time delay information and reliability information.
The method according to any one of claims 26 to 30, wherein the receiving, by the first access network device, the first indication information sent by the terminal device comprises:

and the first access network equipment receives the first indication information sent by the terminal equipment through first core network equipment, wherein the first core network equipment is the core network equipment in the first network or system.
The method according to any one of claims 26 to 31, wherein the first network or system switching the state of the terminal device in the first network or system from an active state to an inactive state or a suspended state comprises:

the first access network equipment sends a first signaling to the terminal equipment, wherein the first signaling is used for switching the state of the terminal equipment in the first network or system from an active state to an inactive state or a suspended state.
The method according to claim 32, wherein if the state of the terminal device is an inactive state, the terminal device maintains network connections with a core network side and an access network side in the first network or system, and the core network side and the access network side of the first network or system and the terminal device side both maintain context information of the terminal device in the first network or system; or

And if the state of the terminal equipment is a suspended state, the terminal equipment releases network connection with a core network side and an access network side in the first network or system, and the core network side and the access network side of the first network or system and the terminal equipment side keep the context information of the terminal equipment in the first network or system.
The method according to claim 32 or 33, wherein the first signaling comprises at least one of the following information:

time information;

second indication information, configured to indicate whether the terminal device needs to monitor a paging message of the first network or system in the inactive state or the suspended state;

and third indication information, configured to indicate whether a notification message needs to be sent to a network device in the first network or system when the terminal device returns to the first network or system.
The method according to claim 34, wherein the time information is time information that the terminal device remains in the inactive state or the suspend state.
The method of claim 35, further comprising:

the first access network equipment starts a third timer according to the time information;

if the third timer is expired, the first access network device does not receive the notification message returned by the terminal device to the first network or system, and the terminal device is in an inactive state, the first access network device releases the context information of the terminal device in the first network or system, and releases the network connection between the access network side and the core network side of the terminal device in the first network or system; or

If the third timer is expired, the first access network device does not receive the notification message that the terminal device returns to the first network or system, and the terminal device is in a suspended state, and the first access network device releases the context information of the terminal device in the first network or system.
The method of claim 36, wherein the time information is time information used by the terminal device to listen for paging messages.
The method of any one of claims 32 to 37, further comprising:

the first access network device determines whether to send a paging message to the terminal device and/or a type of the sent paging message.
The method of claim 38, wherein the determining, by the first access network device, whether to send the paging message to the terminal device and/or the type of the sent paging message comprises:

the first access network device determines whether to transmit the paging message and/or a type of the transmitted paging message according to at least one of:

time information in the first signaling;

whether a notification message sent by the terminal equipment and returned to the first network or system is received;

attribute information of downlink data to be transmitted in the first network or system.
The method of claim 39, wherein the types of the paging messages comprise a first type of paging message and a second type of paging message, and wherein the second type of paging message comprises attribute information of downlink data to be transmitted.
The method of claim 40, wherein the first access network device determines whether to send the paging message and/or the type of paging message sent based on at least one of: time information in the first signaling; whether a notification message sent by the terminal equipment and returned to the first network or system is received; the attribute information of the downlink data to be transmitted in the first network or system includes:

if the notification message sent by the terminal equipment is not received, determining not to send the first paging message; or

And if the notification message sent by the terminal equipment is received, determining to send the first paging message.
The method of claim 40, wherein the first access network device determines whether to send the paging message and/or the type of paging message sent based on at least one of: time information in the first signaling; whether a notification message sent by the terminal equipment and returned to the first network or system is received; the attribute information of the downlink data to be transmitted in the first network or system includes:

if the notification message sent by the terminal equipment is not received, determining not to send the second paging message; or

And if the notification message sent by the terminal equipment is received, determining to send the second paging message.
The method of claim 40, wherein the first access network device determines whether to send the paging message and/or the type of paging message sent based on at least one of: time information in the first signaling; whether a notification message sent by the terminal equipment and returned to the first network or system is received; the attribute information of the downlink data to be transmitted in the first network or system includes:

before the fourth timer is overtime, determining to send the second paging message; or

And when the fourth timer is overtime, determining to send the first paging message, wherein the duration of the fourth timer is determined according to the time information.
The method of claim 40, wherein the first access network device determines whether to send the paging message and/or the type of paging message sent based on at least one of: time information in the first signaling; whether a notification message sent by the terminal equipment and returned to the first network or system is received; the attribute information of the downlink data to be transmitted in the first network or system includes:

if the priority of the downlink data to be transmitted is higher than a specific priority threshold, determining to send the second paging message; or

And if the priority of the downlink data to be transmitted is higher than a specific priority threshold, determining to send the first paging message.
The method of any one of claims 39 to 44, further comprising:

the first access network device receives a paging request message sent by a first core network device, where the paging request message is used to instruct the first access network device to initiate a paging message to the terminal device, and the first core network device is a core network device in the first network or system.
The method of claim 45, wherein the paging request message is a first type paging request message or a second type paging request message, and wherein the second type paging request message includes attribute information of the downlink data to be transmitted.
The method according to claim 45, wherein said first core network device is an Access management function, AMF, entity or a mobility management network element, MME.
The method according to any of claims 39 to 47, wherein the service attribute information of the downlink data comprises at least one of:

protocol data unit PDU session information, QoS flow information, data radio bearer DRB information, and 5QI information of the downlink data.
The method of any one of claims 39 to 48, further comprising:

and if the state of the terminal equipment in the first network or the first system is a non-activated state and the first access network equipment does not receive the paging response message replied by the terminal equipment, the first access network equipment releases the context information of the terminal equipment in the first network or the first system and releases the connection of the core network side of the terminal equipment.
The method of any one of claims 39 to 48, further comprising:

and if the state of the terminal equipment in the first network or the first system is a suspended state and the first access network equipment does not receive a paging response message replied by the terminal equipment, the first access network equipment releases the context information of the terminal equipment in the first network or the first system.
The method of claim 49 or 50, further comprising:

and the first access network equipment instructs the core network equipment of the first network or system to release the context information of the terminal equipment in the first network or system.
The method of claim 51, further comprising:

and the first access network equipment transmits the cached downlink data back to a User Plane Function (UPF) entity of the first network or the first system or discards the downlink data.
The method of any one of claims 39 to 48, further comprising:

and if the first access network equipment does not receive the paging response message replied by the terminal equipment, the first access network equipment keeps the state of the terminal equipment in the first network or system in an inactive state or a suspended state.
A method of wireless communication, comprising:

the method includes that first core network equipment receives first indication information sent by terminal equipment, the first indication information is used for indicating that the terminal equipment needs to be switched from a first network or a system to a second network or the system, and the first core network equipment is core network equipment in the first network or the system.
The method according to claim 54, wherein the first indication information comprises at least one of:

the state information of the terminal device in the first network or system is expected, the information of the terminal device switched to the second network or system for service transmission is switched to, the information of the terminal device switched to the service transmitted by the second network or system is switched to, the time length information of the terminal device in the second network or system for service transmission is expected, and the information of the service paged by the first network is expected by the terminal device.
The method according to claim 55, wherein the information of the traffic transmitted by the terminal device to handover to the second network or system comprises type information of the traffic and/or quality of service (QoS) information of the traffic;

the service information that the terminal device desires to be paged by the first network may be type information of the service that the terminal device desires to be paged and/or QoS information of the service.
The method of claim 56, wherein the type information of the service comprises at least one of the following:

voice service, short message service, emergency service, high priority service.
The method according to claim 56 or 57, wherein the QoS information of the traffic comprises at least one of:

5G service quality indication 5QI, time delay information and reliability information.
The method of any one of claims 54 to 58, further comprising:

the first core network device sends the first indication information to a first access network device, the first access network device is an access network device in the first network or system, and the first indication information is used for the first access network device to switch the state of the terminal device in the first network or system from an active state to an inactive state or a suspended state.
The method of any one of claims 54 to 59, further comprising:

the first core network device determines whether to send a paging message to the terminal device and/or the type of the sent paging message.
The method according to any of claims 54 to 60, wherein the determining by the first core network device whether to send the paging message to the terminal device and/or the type of the sent paging message comprises:

the first core network device determines whether to transmit the paging message and/or the type of the transmitted paging message according to at least one of the following:

whether a notification message sent by the terminal equipment and returned to the first network or system is received;

attribute information of downlink data to be transmitted in the first network or system.
The method of claim 61, wherein the types of the paging messages comprise a first type of paging message and a second type of paging message, and wherein the second type of paging message comprises attribute information of downlink data to be transmitted.
The method according to claim 62, wherein the first core network device determines whether to send the paging message and/or the type of the sent paging message according to at least one of: whether a notification message sent by the terminal equipment and returned to the first network or system is received; the attribute information of the downlink data to be transmitted in the first network or system includes:

if the notification message sent by the terminal equipment is not received, determining not to send the first paging message; or

And if the notification message sent by the terminal equipment is received, determining to send the first paging message.
The method according to claim 63, wherein the first core network device determines whether to send the paging message and/or the type of the sent paging message according to at least one of: whether a notification message sent by the terminal equipment and returned to the first network or system is received; the attribute information of the downlink data to be transmitted in the first network or system includes:

if the notification message sent by the terminal equipment is not received, determining not to send the second paging message; or

And if the notification message sent by the terminal equipment is received, determining to send the second paging message.
The method according to claim 63, wherein the first core network device determines whether to send the paging message and/or the type of the sent paging message according to at least one of: whether a notification message sent by the terminal equipment and returned to the first network or system is received; the attribute information of the downlink data to be transmitted in the first network or system includes:

if the priority of the downlink data to be transmitted is higher than a specific priority threshold, determining to send the second paging message; or

And if the priority of the downlink data to be transmitted is higher than a specific priority threshold, determining to send the first paging message.
The method according to any of claims 61 to 65, wherein the service attribute information of the downlink data comprises at least one of:

protocol data unit PDU session information, QoS flow information, data radio bearer DRB information, and 5QI information of the downlink data.
The method of any one of claims 60 to 66, further comprising:

and if the paging response message replied by the terminal equipment is not received, the first core network equipment initiates a detachment process.
The method of any one of claims 60 to 66, further comprising:

if the paging response message replied by the terminal equipment is not received, the first core network equipment releases the context information of the terminal equipment in the first network or system, and instructs the access network equipment of the first network or system to release the context information of the terminal equipment in the first network or system.
The method of any one of claims 60 to 66, further comprising:

and if the paging response message replied by the terminal equipment is not received, the first core network equipment keeps the context information of the terminal equipment in the first network or the first system.
The method of any one of claims 54 to 60, further comprising:

the first core network device sends a paging request message to a first access network device, where the paging request message is used to instruct the first access network device to initiate a paging message to the terminal device.
The method of claim 70, wherein the paging request message is a first type paging request message or a second type paging request message, and wherein the second type paging request message includes attribute information of downlink data to be transmitted.
The method according to any of claims 54 to 71, wherein said first core network device is an Access management function, AMF, entity or a mobility management network element, MME.
A terminal device, comprising:

a communication module, configured to send first indication information to a first network device, where the first indication information is used to indicate that the terminal device is to be handed over from a first network or system to a second network or system, and the first network device is an access network device or a core network device in the first network or system.
The terminal device of claim 73, wherein the first indication information comprises at least one of:

the state information of the terminal device in the first network or system is expected, the information of the terminal device switched to the second network or system for service transmission is switched to, the information of the terminal device switched to the service transmitted by the second network or system is switched to, the time length information of the terminal device in the second network or system for service transmission is expected, and the information of the service paged by the first network is expected by the terminal device.
The terminal device according to claim 74, wherein the information of the traffic transmitted by the terminal device to handover to the second network or system comprises type information of the traffic and/or quality of service (QoS) information of the traffic;

the service information that the terminal device desires to be paged by the first network may be type information of the service that the terminal device desires to be paged and/or QoS information of the service.
The terminal device of claim 75, wherein the type information of the service comprises at least one of the following:

voice service, short message service, emergency service, high priority service.
The terminal device according to claim 75 or 76, wherein the QoS information of the traffic comprises at least one of: 5G service quality indication 5QI, time delay information and reliability information.
The terminal device of any one of claims 73 to 77, wherein if the first network device is an access network device in the first network or system, the communication module is specifically configured to:

and sending the first indication information to the first network equipment through first core network equipment, wherein the first core network equipment is core network equipment in the first network or the system.
The terminal device of any one of claims 73 to 78, wherein if the first network device is an access network device in the first network or system, the communication module is further configured to:

and receiving a first signaling sent by the first network equipment, wherein the first signaling is used for switching the state of the terminal equipment in the first network or system from an active state to an inactive state or a suspended state.
The terminal device according to claim 79, wherein if the state of the terminal device is an inactive state, the terminal device maintains network connections with a core network side and an access network side in the first network or system, and the core network side and the access network side of the first network or system and the terminal device side both maintain context information of the terminal device in the first network or system; or

And if the state of the terminal equipment is a suspended state, the terminal equipment releases network connection with a core network side and an access network side in the first network or system, and the core network side and the access network side of the first network or system and the terminal equipment side keep the context information of the terminal equipment in the first network or system.
The terminal device according to claim 79 or 80, wherein the first signaling comprises at least one of the following information:

time information;

second indication information, configured to indicate whether the terminal device needs to monitor a paging message of the first network or system in the inactive state or the suspended state;

and third indication information, configured to indicate whether a notification message needs to be sent to a network device in the first network or system when the terminal device returns to the first network or system.
The terminal device of claim 81, wherein the time information is time information for the terminal device to remain in the inactive state or the suspended state.
The terminal device of claim 82, wherein the terminal device further comprises:

the processing module is used for starting a first timer according to the time information;

and if the first timer is timed out, the terminal equipment does not return to the first network or system, releasing the context information of the terminal equipment in the first network or system, and switching the state of the terminal equipment in the first network or system to an idle state.
The terminal device of claim 81, wherein the time information is time information used by the terminal device to listen for paging messages.
The terminal device of claim 84, wherein the terminal device further comprises:

the processing module is used for starting a second timer according to the time information;

the communication module is further configured to: and starting to monitor the paging message of the first network or system when the second timer is timed out.
The terminal device of any one of claims 81-84, wherein the terminal device further comprises:

and the determining module is used for determining whether to monitor the paging message in the first network or system according to the second indication information.
The terminal device of any one of claims 81-86, wherein the terminal device further comprises

And the determining module is used for determining whether to send a notification message to the first network device according to the third indication information if the terminal device returns to the first network or the system.
The terminal device of any one of claims 73-87, wherein the communication module is further configured to:

and receiving a paging message sent by the first network equipment.
The terminal device of claim 88, wherein the type of the paging message is a first type paging message or a second type paging message, and wherein the second type paging message includes attribute information of downlink data to be transmitted.
The terminal device of claim 89, wherein the service attribute information of the downlink data comprises at least one of:

protocol data unit PDU session information, QoS flow information, data radio bearer DRB information, and 5QI information of the downlink data.
The terminal device according to claim 89 or 90, wherein the terminal device further comprises:

a determining module, configured to determine whether to reply to the first network device with a page response message.
The terminal device of claim 91, wherein the determining module is specifically configured to:

determining whether to reply to the page response message according to at least one of:

service information in the second network or system, type information of the paging message, service attribute information of the downlink data in the paging message, and priorities of the first network or system and the second network or system.
The terminal device of claim 92, wherein the determining module is specifically configured to:

if the service transmission of the terminal equipment in the second network or the system is not finished, determining not to reply the paging response message; or

And if the priority of the service of the terminal equipment in the second network or the system is higher than a specific priority threshold, determining not to reply the paging response message.
The terminal device of claim 92, wherein the determining module is specifically configured to:

if the paging message is the second paging message, determining to reply the paging response message; or

And if the paging message is the first paging message, determining to reply the paging response message.
The terminal device of claim 92, wherein the determining module is specifically configured to:

if the priority of the service of the terminal equipment in the second network or the system is higher than the priority of the downlink data, determining not to reply the paging response message; or

And if the priority of the second network or system is higher than that of the first network or system, determining not to reply the paging response message.
The terminal device of any of claims 92 to 95, wherein the priorities of the first network or system and the second network or system are determined from subscription information of the terminal device, or are configured by a network device, or are pre-configured.
The terminal device according to any one of claims 73 to 96, wherein the first network or system and the second network or system are networks or systems corresponding to a plurality of standards supported by the terminal device.
An access network device, comprising:

a communication module, configured to receive first indication information sent by a terminal device, where the first indication information is used to indicate that the terminal device is to be switched from a first network or system to a second network or system, and the access network device is an access network device in the first network or system;

and the processing module is used for switching the state of the terminal equipment in the first network or system from an activated state to an inactivated state or a suspended state.
The access network device of claim 98, wherein the first indication information comprises at least one of: the state information of the terminal device in the first network or system is expected, the information of the terminal device switched to the second network or system for service transmission is switched to, the information of the terminal device switched to the service transmitted by the second network or system is switched to, the time length information of the terminal device in the second network or system for service transmission is expected, and the information of the service paged by the first network is expected by the terminal device.
The access network device of claim 99, wherein the information of the service executed by the terminal device to handover to the second network or system comprises type information of the service and/or quality of service (QoS) information of the service;

the service information that the terminal device desires to be paged by the first network may be type information of the service that the terminal device desires to be paged and/or QoS information of the service.
The access network device of claim 100, wherein the type information of the service comprises at least one of:

voice service, short message service, emergency service, high priority service.
The access network device of claim 100 or 101, wherein the QoS information of the traffic comprises at least one of:

5G service quality indication 5QI, time delay information and reliability information.
The access network device of any of claims 98 to 102, wherein the communication module is specifically configured to:

and receiving the first indication information sent by the terminal device through a first core network device, where the first core network device is a core network device in the first network or system.
The access network device of any of claims 98 to 103, wherein the communication module is further configured to:

and sending a first signaling to the terminal device, wherein the first signaling is used for switching the state of the terminal device in the first network or system from an active state to an inactive state or a suspended state.
The access network device of claim 104, wherein if the state of the terminal device is an inactive state, the terminal device maintains network connections with a core network side and an access network side in the first network or system, and the core network side and the access network side of the first network or system and the terminal device side both maintain context information of the terminal device in the first network or system; or

And if the state of the terminal equipment is a suspended state, the terminal equipment releases network connection with a core network side and an access network side in the first network or system, and the core network side and the access network side of the first network or system and the terminal equipment side keep the context information of the terminal equipment in the first network or system.
The access network device of claim 104 or 105, wherein the first signaling comprises at least one of the following information: time information;

second indication information, configured to indicate whether the terminal device needs to monitor a paging message of the first network or system in the inactive state or the suspended state;

and third indication information, configured to indicate whether a notification message needs to be sent to a network device in the first network or system when the terminal device returns to the first network or system.
The access network device of claim 106, wherein the time information is time information for the terminal device to remain in the inactive state or the suspended state.
The access network device of claim 107, wherein the processing module is further configured to: starting a third timer according to the time information;

if the third timer is timed out, the notification message that the terminal device returns to the first network or system is not received, and the terminal device is in an inactive state, releasing the context information of the terminal device in the first network or system, and releasing the network connection of the terminal device at the access network side and the core network side in the first network or system; or

And if the third timer is overtime, the notification message that the terminal equipment returns to the first network or the first system is not received, and the terminal equipment is in a suspended state, and the context information of the terminal equipment in the first network or the first system is released.
The access network device of claim 108, wherein the time information is time information used by the terminal device to listen for paging messages.
The access network device of any of claims 105-109, wherein the processing module is further configured to:

it is determined whether to send a paging message to the terminal device and/or the type of paging message sent.
The access network device of claim 110, wherein the processing module is specifically configured to: determining whether to transmit the paging message and/or a type of the transmitted paging message according to at least one of: time information in the first signaling;

whether a notification message sent by the terminal equipment and returned to the first network or system is received;

attribute information of downlink data to be transmitted in the first network or system.
The access network device of claim 111, wherein the types of the paging messages include a first type of paging message and a second type of paging message, wherein the second type of paging message includes attribute information of downlink data to be transmitted.
The access network device of claim 112, wherein the processing module is specifically configured to: if the notification message sent by the terminal equipment is not received, determining not to send the first paging message; or

And if the notification message sent by the terminal equipment is received, determining to send the first paging message.
The access network device of claim 112, wherein the processing module is specifically configured to:

if the notification message sent by the terminal equipment is not received, determining not to send the second paging message; or

And if the notification message sent by the terminal equipment is received, determining to send the second paging message.
The access network device of claim 112, wherein the processing module is specifically configured to:

before the fourth timer is overtime, determining to send the second paging message; or

And when the fourth timer is overtime, determining to send the first paging message, wherein the duration of the fourth timer is determined according to the time information.
The access network device of claim 112, wherein the processing module is specifically configured to:

if the priority of the downlink data to be transmitted is higher than a specific priority threshold, determining to send the second paging message; or

And if the priority of the downlink data to be transmitted is higher than a specific priority threshold, determining to send the first paging message.
The access network device of any of claims 112-116, wherein the communication module is further configured to:

receiving a paging request message sent by a first core network device, where the paging request message is used to instruct the access network device to initiate a paging message to the terminal device, and the first core network device is a core network device in the first network or system.
The access network device of claim 117, wherein the paging request message is a first type paging request message or a second type paging request message, wherein the second type paging request message includes attribute information of the downlink data to be transmitted.
The access network device of claim 117, wherein the first core network device is an access management function, AMF, entity or a mobility management network element, MME.
The access network device of any of claims 111-119, wherein the service attribute information of the downlink data comprises at least one of:

protocol data unit PDU session information, QoS flow information, data radio bearer DRB information, and 5QI information of the downlink data.
The access network device of any of claims 111-120, wherein the processing module is further configured to:

and if the state of the terminal equipment in the first network or the first system is a non-activated state and the paging response message replied by the terminal equipment is not received, releasing the context information of the terminal equipment in the first network or the first system and releasing the connection of the core network side of the terminal equipment.
The access network device of any of claims 111-120, wherein the processing module is further configured to:

and if the state of the terminal equipment in the first network or the first system is a suspended state and the paging response message replied by the terminal equipment is not received, releasing the context information of the terminal equipment in the first network or the first system.
The access network device of claim 121 or 122, wherein the processing module is further configured to:

and instructing the core network equipment of the first network or system to release the context information of the terminal equipment in the first network or system.
The access network device of claim 123, wherein the communication module is further configured to:

the access network equipment transmits the cached downlink data back to a User Plane Function (UPF) entity of the first network or the first system;

the processing module is further configured to: and discarding the downlink data.
The access network device of any of claims 111-120, wherein the processing module is further configured to:

and if the access network equipment does not receive the paging response message replied by the terminal equipment, the access network equipment keeps the state of the terminal equipment in the first network or system in an inactive state or a suspended state.
A core network device, comprising:

the communication module is configured to receive first indication information sent by a terminal device, where the first indication information is used to indicate that the terminal device is to be switched from a first network or system to a second network or system, and the core network device is a core network device in the first network or system.
The core network device of claim 126, wherein the first indication information comprises at least one of:

the state information of the terminal device in the first network or system is expected, the information of the terminal device switched to the second network or system for service transmission is switched to, the information of the terminal device switched to the service transmitted by the second network or system is switched to, the time length information of the terminal device in the second network or system for service transmission is expected, and the information of the service paged by the first network is expected by the terminal device.
The core network device according to claim 127, wherein the information about the service transmitted by the terminal device handing over to the second network or system comprises type information of the service and/or quality of service (QoS) information of the service;

the service information that the terminal device desires to be paged by the first network may be type information of the service that the terminal device desires to be paged and/or QoS information of the service.
The core network device of claim 128, wherein the type information of the service comprises at least one of:

voice service, short message service, emergency service, high priority service.
The core network device of claim 128 or 129, wherein the QoS information of the service comprises at least one of:

5G service quality indication 5QI, time delay information and reliability information.
The core network device of any one of claims 126 to 130, wherein the communication module is further configured to send indication information to a first access network device, where the first access network device is an access network device in the first network or system, and the indication information is used for the first access network device to switch the state of the terminal device in the first network or system from an active state to an inactive state or a suspended state.
The core network device of any one of claims 126 to 131, wherein the core network device further comprises:

the determining module is used for determining whether to send the paging message to the terminal equipment and/or the type of the sent paging message.
The core network device of any one of claims 126 to 132, wherein the determining module is specifically configured to:

determining whether to transmit the paging message and/or a type of the transmitted paging message according to at least one of:

whether a notification message sent by the terminal equipment and returned to the first network or system is received;

attribute information of downlink data to be transmitted in the first network or system.
The core network device of claim 133, wherein the types of the paging messages include a first type of paging message and a second type of paging message, and wherein the second type of paging message includes attribute information of downlink data to be transmitted.
The core network device of claim 134, wherein the determining module is specifically configured to:

if the notification message sent by the terminal equipment is not received, determining not to send the first paging message; or

And if the notification message sent by the terminal equipment is received, determining to send the first paging message.
The core network device of claim 135, wherein the determining module is specifically configured to:

if the notification message sent by the terminal equipment is not received, determining not to send the second paging message; or

And if the notification message sent by the terminal equipment is received, determining to send the second paging message.
The core network device of claim 135, wherein the determining module is further configured to:

if the priority of the downlink data to be transmitted is higher than a specific priority threshold, determining to send the second paging message; or

And if the priority of the downlink data to be transmitted is higher than a specific priority threshold, determining to send the first paging message.
The core network device of any one of claims 133 to 137, wherein the service attribute information of the downlink data includes at least one of:

protocol data unit PDU session information, QoS flow information, data radio bearer DRB information, and 5QI information of the downlink data.
The core network device of any one of claims 132 to 138, wherein the core network device further comprises: and the processing module is used for initiating a detach process if the paging response message replied by the terminal equipment is not received.
The core network device of any one of claims 132 to 138, wherein the core network device further comprises:

and the processing module is used for releasing the context information of the terminal equipment in the first network or system and indicating the access network equipment of the first network or system to release the context information of the terminal equipment in the first network or system if the paging response message replied by the terminal equipment is not received.
The core network device of any one of claims 132 to 138, wherein the core network device further comprises:

and the processing module is used for keeping the context information of the terminal equipment in the first network or the system if the paging response message replied by the terminal equipment is not received.
The core network device of any one of claims 126 to 132, wherein the communication module is further configured to: and sending a paging request message to the first access network equipment, wherein the paging request message is used for indicating the first access network equipment to initiate a paging message to the terminal equipment.
The core network device of claim 142, wherein the paging request message is a first type paging request message or a second type paging request message, and wherein the second type paging request message includes attribute information of downlink data to be transmitted.
Core network device according to any of claims 126 to 143, wherein said core network device is an access management function, AMF, entity or a mobility management network element, MME.
A terminal device, comprising: a processor and a memory for storing a computer program, the processor being configured to invoke and execute the computer program stored in the memory to perform the method of any of claims 1 to 25.
An access network device, comprising: a processor and a memory for storing a computer program, the processor being configured to invoke and execute the computer program stored in the memory to perform the method of any of claims 26 to 53.
A core network device, comprising: a processor and a memory for storing a computer program, the processor for invoking and executing the computer program stored in the memory, performing the method of any of claims 54-72.
A chip, comprising: a processor for calling and running a computer program from a memory to cause a device on which the chip is installed to perform a method as claimed in any one of claims 1 to 25, or a method as claimed in any one of claims 26 to 53, or a method as claimed in any one of claims 54 to 72.
A computer-readable storage medium for storing a computer program which causes a computer to perform the method of any one of claims 1 to 25, or the method of any one of claims 26 to 53, or the method of any one of claims 54 to 72.
A computer program product comprising computer program instructions to cause a computer to perform the method of any one of claims 1 to 25, or the method of any one of claims 26 to 53, or the method of any one of claims 54 to 72.
A computer program, characterized in that the computer program causes a computer to perform the method of any of claims 1 to 25, or the method of any of claims 26 to 53, or the method of any of claims 54 to 72.